I will try swapping the solenoids. I had my son help and I watched the box, when you plug the main power to box in, the left and right lights with blink like the planter switches a time or 2 and then nothing will happen after that no matter how many times you raise and lower planter. The markers never work.
If you unplug main power and plug back in, it clicks the marker solenoids a time or 2 and then nothing.